[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.774096] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.365853] random: sshd: uninitialized urandom read (32 bytes read) [ 21.677270] random: sshd: uninitialized urandom read (32 bytes read) [ 22.178625] random: sshd: uninitialized urandom read (32 bytes read) [ 30.344215] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 35.874595] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.960971] BUG: unable to handle kernel paging request at ffffeafff9198020 [ 35.968353] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.974601] PGD 0 [ 35.976557] [ 35.978179] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.982651] Dumping ftrace buffer: [ 35.986167] (ftrace buffer empty) [ 35.989860] Modules linked in: [ 35.993149] CPU: 0 PID: 3801 Comm: syz-executor706 Not tainted 4.9.122-g54068d6 #26 [ 36.000915] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.010245] task: ffff8801b8473000 task.stack: ffff8801b5fc0000 [ 36.016328] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.025115] RSP: 0018:ffff8801b5fc7948 EFLAGS: 00010246 [ 36.030546] RAX: dffffc0000000000 RBX: ffffeafff9198000 RCX: ffffea0006d28000 [ 36.037789] RDX: 1ffffd5fff233004 RSI: ffffffff814f5918 RDI: ffffeafff9198000 [ 36.045037] RBP: ffff8801b5fc7970 R08: 0000000000033d20 R09: 0000000000000001 [ 36.052330] R10: ffff8801b8473000 R11: 0000000000000001 R12: ffff8801b5fc7c08 [ 36.059583] R13: ffffeafff9198020 R14: ffffeafff9198000 R15: 0000000000000001 [ 36.066832] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.075033] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.080938] CR2: ffffeafff9198020 CR3: 00000001c0656000 CR4: 00000000001606f0 [ 36.088185] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.095446] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.102691] Stack: [ 36.104817] ffffeafff9198020 ffff8801b5fc7c08 ffff8801c2b75800 ffffeafff9198000 [ 36.112949] ffff8801b7f62478 ffff8801b5fc79c8 ffffffff8154cb8f ffff8801b5fc7c18 [ 36.120945] ffff8801b5fc7c10 ffff8801b5fc7c88 00003ffe466001e0 00000001c2b75000 [ 36.128948] Call Trace: [ 36.131526] [] zap_huge_pmd+0x16f/0x860 [ 36.137130] [] unmap_page_range+0x12ad/0x1730 [ 36.143248] [] ? vm_normal_page_pmd+0x310/0x310 [ 36.149549] [] unmap_single_vma+0x101/0x260 [ 36.155497] [] unmap_vmas+0x102/0x1d0 [ 36.160926] [] exit_mmap+0x214/0x3f0 [ 36.166261] [] ? SyS_munmap+0xa0/0xa0 [ 36.171688] [] ? up_write+0x1a/0x60 [ 36.176942] [] mmput+0xf3/0x2d0 [ 36.181848] [] do_exit+0x906/0x27b0 [ 36.187098] [] ? release_task.part.19+0x1210/0x1210 [ 36.193793] [] ? up_write+0x1a/0x60 [ 36.199055] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.205174] [] ? mprotect_fixup+0x930/0x930 [ 36.211122] [] do_group_exit+0x111/0x340 [ 36.216808] [] ? do_group_exit+0x340/0x340 [ 36.222669] [] SyS_exit_group+0x1d/0x20 [ 36.228272] [] do_syscall_64+0x1a6/0x490 [ 36.234161] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.241063] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 36.268070] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.274399] RSP [ 36.278010] CR2: ffffeafff9198020 [ 36.281457] ---[ end trace 685008f1e5976e95 ]--- [ 36.286198] Kernel panic - not syncing: Fatal exception [ 36.291866] Dumping ftrace buffer: [ 36.295385] (ftrace buffer empty) [ 36.299070] Kernel Offset: disabled [ 36.302678] Rebooting in 86400 seconds..